Summertime surface mass balance and atmospheric processes on the McMurdo Ice Shelf, Antarctica.
The aim of this research was to demonstrate the relationship between variations in summertime surface mass balance of the McMurdo Ice Shelf and atmospheric processes. The approach encompassed a broad range of techniques. An existing energy balance mass balance model was adapted to deal with debris-c...
Main Author: | |
---|---|
Format: | Other/Unknown Material |
Language: | English |
Published: |
University of Canterbury. Geography
2009
|
Subjects: | |
Online Access: | http://hdl.handle.net/10092/2630 https://doi.org/10.26021/7493 |
id |
ftunivcanter:oai:ir.canterbury.ac.nz:10092/2630 |
---|---|
record_format |
openpolar |
spelling |
ftunivcanter:oai:ir.canterbury.ac.nz:10092/2630 2023-05-15T13:49:25+02:00 Summertime surface mass balance and atmospheric processes on the McMurdo Ice Shelf, Antarctica. Clendon, Penelope Catherine 2009 application/pdf http://hdl.handle.net/10092/2630 https://doi.org/10.26021/7493 en eng University of Canterbury. Geography NZCU http://hdl.handle.net/10092/2630 http://dx.doi.org/10.26021/7493 Copyright Penelope Catherine Clendon https://canterbury.libguides.com/rights/theses Ice shelves McMurdo Ice Shelf surface mass balance Theses / Dissertations 2009 ftunivcanter https://doi.org/10.26021/7493 2022-09-08T13:35:52Z The aim of this research was to demonstrate the relationship between variations in summertime surface mass balance of the McMurdo Ice Shelf and atmospheric processes. The approach encompassed a broad range of techniques. An existing energy balance mass balance model was adapted to deal with debris-covered ice surfaces and modified to produce distributed output. Point based surface energy and mass balance for two key surfaces of the ice shelf were linked to different synoptic types that were identified using a manual synoptic classification. The distributed model was initialised with distributed parameters derived from satellite remote sensing and forced with data from a regional climate model. Patterns of summertime surface mass balance produced by the distributed model were assessed against stake measurements and with respect to atmospheric processes. During the summers of 2003-2004 and 2004-2005 an automatic weather station (AWS) was operated on bare and debris-covered ice surfaces of the McMurdo Ice shelf, Antarctica. Surface mass balance was calculated using the energy balance model driven by the data from the AWS and additional data from permanent climate stations. Net mass balance for the measurement period was reproduced reasonably well when validated against directly measured turbulent fluxes, stake measurements, and continuously measured surface height at the AWS. For the bare ice surface net radiation provided the major energy input for ablation, whereas sensible heat flux was a second heat source. Ablation was by both melt (70%) and sublimation (30%). At the debris-covered ice site investigated, it is inferred that the debris cover is sufficient to insulate the underlying ice from ablation. Synoptic weather situations were analysed based on AVHRR composite images and surface pressure charts. Three distinct synoptic situations were found to occur during the summers, these were defined as Type A, low pressure system residing in the Ross Sea Embayment; Type B, anticyclonic conditions across region; and ... Other/Unknown Material Antarc* Antarctica Ice Shelf Ice Shelves McMurdo Ice Shelf Ross Sea University of Canterbury, Christchurch: UC Research Repository McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) Ross Sea |
institution |
Open Polar |
collection |
University of Canterbury, Christchurch: UC Research Repository |
op_collection_id |
ftunivcanter |
language |
English |
topic |
Ice shelves McMurdo Ice Shelf surface mass balance |
spellingShingle |
Ice shelves McMurdo Ice Shelf surface mass balance Clendon, Penelope Catherine Summertime surface mass balance and atmospheric processes on the McMurdo Ice Shelf, Antarctica. |
topic_facet |
Ice shelves McMurdo Ice Shelf surface mass balance |
description |
The aim of this research was to demonstrate the relationship between variations in summertime surface mass balance of the McMurdo Ice Shelf and atmospheric processes. The approach encompassed a broad range of techniques. An existing energy balance mass balance model was adapted to deal with debris-covered ice surfaces and modified to produce distributed output. Point based surface energy and mass balance for two key surfaces of the ice shelf were linked to different synoptic types that were identified using a manual synoptic classification. The distributed model was initialised with distributed parameters derived from satellite remote sensing and forced with data from a regional climate model. Patterns of summertime surface mass balance produced by the distributed model were assessed against stake measurements and with respect to atmospheric processes. During the summers of 2003-2004 and 2004-2005 an automatic weather station (AWS) was operated on bare and debris-covered ice surfaces of the McMurdo Ice shelf, Antarctica. Surface mass balance was calculated using the energy balance model driven by the data from the AWS and additional data from permanent climate stations. Net mass balance for the measurement period was reproduced reasonably well when validated against directly measured turbulent fluxes, stake measurements, and continuously measured surface height at the AWS. For the bare ice surface net radiation provided the major energy input for ablation, whereas sensible heat flux was a second heat source. Ablation was by both melt (70%) and sublimation (30%). At the debris-covered ice site investigated, it is inferred that the debris cover is sufficient to insulate the underlying ice from ablation. Synoptic weather situations were analysed based on AVHRR composite images and surface pressure charts. Three distinct synoptic situations were found to occur during the summers, these were defined as Type A, low pressure system residing in the Ross Sea Embayment; Type B, anticyclonic conditions across region; and ... |
format |
Other/Unknown Material |
author |
Clendon, Penelope Catherine |
author_facet |
Clendon, Penelope Catherine |
author_sort |
Clendon, Penelope Catherine |
title |
Summertime surface mass balance and atmospheric processes on the McMurdo Ice Shelf, Antarctica. |
title_short |
Summertime surface mass balance and atmospheric processes on the McMurdo Ice Shelf, Antarctica. |
title_full |
Summertime surface mass balance and atmospheric processes on the McMurdo Ice Shelf, Antarctica. |
title_fullStr |
Summertime surface mass balance and atmospheric processes on the McMurdo Ice Shelf, Antarctica. |
title_full_unstemmed |
Summertime surface mass balance and atmospheric processes on the McMurdo Ice Shelf, Antarctica. |
title_sort |
summertime surface mass balance and atmospheric processes on the mcmurdo ice shelf, antarctica. |
publisher |
University of Canterbury. Geography |
publishDate |
2009 |
url |
http://hdl.handle.net/10092/2630 https://doi.org/10.26021/7493 |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
McMurdo Ice Shelf Ross Sea |
geographic_facet |
McMurdo Ice Shelf Ross Sea |
genre |
Antarc* Antarctica Ice Shelf Ice Shelves McMurdo Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctica Ice Shelf Ice Shelves McMurdo Ice Shelf Ross Sea |
op_relation |
NZCU http://hdl.handle.net/10092/2630 http://dx.doi.org/10.26021/7493 |
op_rights |
Copyright Penelope Catherine Clendon https://canterbury.libguides.com/rights/theses |
op_doi |
https://doi.org/10.26021/7493 |
_version_ |
1766251348785889280 |